2006 IBC, IMC.
Major remodel of a single story building w/ full basement, non sprinklered, type V-B, proposed B occupancy. The ceiling space between the T grid and the upper ceiling floor assembly has been and will be used as a return air plenum.
The place was built in the late 80's. It is not a change of occupancy.
The entire ceiling of the basement is insulated with fiberglass kraft/foil faced insulation. It is fullly exposed, with no ignition barrier (it states right on it that it must be covered w/approved building material).
I will be contacting the contractor tomorrow to let him know that it will not be approved to leave the insulation there as it is.
He will probably propose covering it with a foil faced or white paper vapor barrier that has the required flame spread etc. What I don't know is if the kraft paper should be removed first, or if it will be acceptable to simply cover it with another vapor barrier.
The purpose of the insulation is for sound only (as far as I know at this point).
I don't recall the brand of the insulation, but it is 20+ years old. I will find out the brand and see if I can find out what an approved covering is as far as they are concerned.
Anyone out there run into this in their past?